Improvement in piston - rod stuffing- boxes



`UNITED STATES .PATENT OFFICE.

JOSEPH M. SEARLE, OF STANHOPE, NEW JERSEY.

lMPROVEMENT IN- PlSTO-N-ROD STUFFlNG-BOXES.

Specification forming part of Letters Patent No. 168, 189, dated September28, 1875 application filed July 31, 1875.

To all whom it may concern:

Beit known that I,JosEPH M. SEARLE, of Stanhope, in the county of Sussex and State of New Jersey, have invented a new and Improved Piston-Rod Stuffing-B0X, ofwhich the following is a speciication:

In the accompanying drawing, Figure l represents avertical central section `on the line c c, Fig. 2, of my improved stufng-box for piston-rods, and Fig. 2 represents a top view of the same.

Similar letters of :reference indicate corresponding parts.

My invention relates to an improved stuffing-box for the piston-rods of steam-cylinders, being constructed in such a manner at the cylinder-heads as to be seif-adjustable, without requiring the continual screwing up ofthe i box to prevent theleaking of the same. The packing may be used as long as a single circular strand remains around the piston-rod, it keeping the stuffing-box perfectly steamtight.

This invention is an improvement on that described in Letters Patent No. 154,613, and relates to the arrangement of a conically-.recessed cup and a spring, the latter causing said cup to'act on the packingagaiust or oppositely `to the steam issuing from the pistoncylinder, inthe mannerphereinafter described..

In the drawing, A represents a cylindrical cup, which is fitted accurately to the pistonrod, so as to hug the same, and made of conically tapering shape toward the packing, placed in the stuffing-box of the cylinder-head in the usual manner.

The cup A is applied to the stuffing-box of the cylinder head by a gland, B, that is screwed by strong bolts to the ange of the same, and rigidly seated thereon. shoulder or liange, B', at the end of gland B, retains the cup in such position that its tapering end projectsinto and slides in the stuffingbox. A spiral spring, C, is interposed between the shoulder B and an outer collar or rim, A', of the cup, being of such strength that it presses the cup tightly on the packing as soon as the steam is shut off, but does not overcome the pressure of the steam, which causes the packing to press against the tapering or concave surface of thecup, and hug thereby the piston or valve-stem tightly, preventing the blowing through of the steam after the packing' gets worn and does not entirely fill the stuffing-box.'

The interposition of the packing prevent-s the speedy corrosion of the spring by cutting oft' access of steamto it. The arrangement of parts also enables the flange B to be fitted loosely to the piston-rod, thus avoiding friction at that point.

What I claim is- The arrangementof the spring-encircled cup A, with its conical-recessed end toward the LT. M. sEAELE.

Witnesses:

J. D. LAURENCE, F. C. WILKINSON.

An interior' 

